In a large bowl, combine soy sauce, brown sugar, garlic powder, ginger, onion and bourbon; stir until sugar has dissolved. Add chicken and stir to coat. Cover and refrigerate for several hours or overnight.
Place chicken and the marinade in an 8 x 8 inch glass baking dish and bake in a preheated 350°F. oven for 45 minutes, basting every 10 minutes with pan juices. Remove chicken.
Optional: Scrape pan juices with all the brown bits into a frying pan. Heat over medium heat and add 2 T white wine. Stir and add chicken. Serve immediately with pan juices over cooked rice.
Also good with Vegetable Lo Mein